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International Heat Transfer Conference 6

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

EFFECT OF UNIFORM FOULING DEPOSIT ON TOTAL EFFICIENCY OF EXTENDED HEAT TRANSFER SURFACES

Norman Epstein
Department of Chemical Engineering, University of British Columbia, Vancouver, British Columbia V6T 1W5, Canada

Ken Sandhu
University of British Columbia, Vancouver, B.C. V6T 1W5

DOI: 10.1615/IHTC6.1910
pages 397-402

Abstract

The effect on total surface efficiency of adding a uniform dirt deposit to the extended (prime plus fin) surface of a uniform-finned heat exchanger is explored by means of two mathematical models—one which treats the dirt deposit on the fin as a thermal resistor in series with the adjacent fluid (Series Model) and the other which treats this deposit as a thermal conductor in parallel with the fin (Parallel Model). The change in total surface efficiency brought about by different combinations of the dimensionless model parameters, within the range of these parameters likely to be encountered in practice, is computed by each model. Some interesting properties of the models are brought to light, including some surprisingly similar behaviour modes, as well as some less surprising contrasts. An assessment is made of the relative merits of each model under different conditions.

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